Fire-extinguisher



G. T. PEARSONS.

FIRE EXTINGUISHER.

APPLICATHJR mm JUNE28, 1916.

Patented June 14, 1921.

1 county, and State of UNITED STATES PATENT OFFICE;

GEORGE '1. PEABSONS, NEW YORK, N. Y. Q

FBE-EXTINGUISHEB.

Application flied June 28,

To all whom it may concern:

Be it known that I, Gnonon T. PnAnsoNs, a citizen of the United States, residing in the borough of Manhattan, 1n the city,

vented new and useful Improvements in Fire-Extinguishers, of which the following is a specification.

This invention relates used as fire extin ishers, or jet of liquid is ejected to syringes to be in which a stream from a reservoir by piston mechanism wit and it is the object of the invention to provide improved means to at all times connect the piston chamber. with the liquid in the lowermost part of the reservoir to discharge the liquid whether the reservoir is full or partially empty, or held in a horizontal osition or inclined upward or downward rpm the horizontal.

A further object of the invention is to provide improved means to seal the pumping mechanism to prevent leakage when the syringe is not in use.

In carrying out the invention I provide a reservoir or tank and mount a piston chamber therein having suction means to connect said chamber with the reservoir, and connect a flexible tube or tubesto said suction means to extend longitudinally of the reservoir with inlet openings thereto adjacent opposite ends of the reservoir, and said openings adapted to automaticall assume a position in the lowermost part oi the reservoir when the syringe is held in a horizontal or substantially horizontal position, and provide valve mechanism to shut off one of the tube inlets from the suction means to the piston chamber and connect the other tube inlet thereto to discharge the liquid from the reservoir when it is held in difierent angular positions relative to the horizontal.

In the drawing accompanying and forming a part of this specification I have shown a sectional side elevatlon of a syringe wit an embodiment of my invention applied thereto.

I have illustrated an embodiment of my invention in connection with a syringe in which the construction of the pumping mechanism is substantially the same as that disclosed in my copending application filed January 15, 1916, Serial No. 72,207 (patented February 13, 1917, No. 1,215,698) in which there is provided a reservoir or tan for a fire extinguishing liquid consisting of Specification of Letters Patent.

New York, have 111- hin the reservoir,

' voir end 3 in a manner to h piston head Patented June 14, 1921.

1916. Serial No. 106,822.

a body portion 1, preferably cylindrical in shape, and the ends 2 and 3 secured thereto, as by soldering or otherwise, the end 2 havmg-a discharge outlet 4 and a filler opening closed by a plug 5 and the said plug bein constructed with an inwardly opening and outwardly closing spring check valve to permit entrance of air to the reservoir as the liquid is dischar ed therefrom shown in a general way b otted lines. The end 2 is preferably dis ed to permit of standing of the syringe upon a horizontal surface.

Mounted in the reservoir at one side of the axis of the cylinder adjacent the side is a piston chamber or cylinder 6 havin lets 7 and 8 with inwardly wardly closing check valves 9 and 10 adjacent opposite ends to connect the c linder to the reservoir.' The cylinder exten s from the end of the reservoir opposite to the outlet 1 and is connected to the outlet by a chamber 11 which is in the nature of a com pression chamber. A tube 12 slidably engages in a stufiing box 13 in the cylinder end, said tube extendin through a cap 14 into a hollow piston ro secured to and closing one end of the piston rod and to which cap the tube 12 is fixed. The piston rod extends through a stufiing box 16 to the exterior of the cylinder and reservoir op osite to the outlet 4 and has a hand grip 1 fixed thereto, said stufiing box being carried by a nut 18 which also serves to connect the piston chamber to the reserbe hereinafter set forth.

' A piston head 19 having suitable packing to seal it in the cylinder mounted on the piston rod 15 to have a limited to and fro movement between the cap 14, which is in the nature of an abutment, and an abutment or collar 20 fixed to the piston rod. The piston rod is connected to the cylinder 6 through ports 21 therein controlled by the 19 to alternately connect the piston rod and the tube 12 with the cylinder at opposite sides of the piston at the commencement of each outward and inward 'stroke of the piston, andfor which purpose the opening 1: ments 14 and 20, for which purpose the abutments are provided with cone shaped 15, said cap being ends 22 and 23 to cooperate with correspondingly cone-shaped seats in the ends of the a piston. The tube 12 is preferabl centrally of the chamber 11 with the out et 4 offset from the center of said chamber, a tube 24 being connected to the outlet 4 to connect the latter to the chamber 11. The area or diameter of the outlet 4 is preferably less than the diameter of the tube 12 fora purpose to be hereinafter described.

In operation,- assuming the parts to be in the normal position shown in the drawing, as the piston rod is pulled outward and with it the tube 12, the plston will move with the rod due to the engagement of the piston with the abutment 14, the said engagement of the piston with the abutment connecting the piston chamber at the rear of the piston to the iston rod and shutting off communication between the her at the front ofthe piston. Durin this movement of the piston iquid will be rawn cm the reservolr into the piston chamber through the inlet 7 in front of the piston, while the air at the back of the piston will be ejected through the piston and ports 21 into the piston rod and from the piston rod through the tube 12 into the chamber 11, and from the latter through the tube 24 and discharge outlet. During the inward movement of the piston rod it will have a slight free movement independent of the piston until the piston engages with the abutment movement of the piston connecting 36 the forward end of the piston chamber through the piston and ports 21 with the piston rod, and during the inward movement of the piston the li uid previously drawn into the piston cham er in front of the piston will be ejected through the piston and ports 21 into the piston rod, and from the piston rod through the tube 12 into the chamber 11 and from said chamber through the tube 24 and discharge outlet. By having the tube 12 of greater diameter than the tube 24 the volume of liquid in the chamber. 11 will be greater than that which can be ejected through the tube 24 creating a pressure in the chamber 11 with the result that the liquid will be ejected through the tube 24-with increased force, and the outlet which is restricted with relation to the tube 24 will still further create a pressure and increase the force of the stream ejected through the outlet 4. During thisforward movement of the piston liquid will be drawn into the piston chamber in back of the piston.

The piston chamber is referably located at one slde of the center of the reservoir, and to draw the liquid from the lowermost art of the reservoir I connect a flexible tubing to the suction means of the iston chamber, said tubing consisting of w at is commer- 66 cially termed flexible metal hose, compris- .lIl opposite ends,

piston rod and piston cham ing spirally wound and interlockin jointed sheet or metal with asbestos pairing in the joints.

In the embodiment shown two sections of tubes 25, 25 are connected at one end to a T-shaped intake or valve chamber 26 having a part extending in a plane longitudinally and co-axially of the reservoir with inlets said intake being common to both of the suction inlets of the piston chamher, said tubes extending longitudinally of the reservoir with the free end of the inlet adjacent opposite ends of the reservoir. The nature of this tubing is such that it has a universal flexing movement and to cause the inlets to said tubes to automaticall assume a position in the lowermost art 0 the reservoir the free end is weig ted, as shown The intake 26 is directly connected to the inlet 7 of the piston chamber, as at 28, and as shown may be constructed to form the seat for the valve 9', and is connected to the inlet 8 by a tube 29 through a con ling 3O constructed to form the seat for tl ie valve 10. The intake is preferably located substantially midway between the ends of the reservoir with the T-portion thereof located I at some distance from the side of the reservoir, as shown and by which construction the amount of flexure of the tube required to cause the inlets thereto to assume a position adjacent the side of the reservoir will be materially reduced.

It will be obvious that while, as shown, the ends of the tubing assume a position at the side of the reservoir which is directly opposite or below the piston chamber, should,- the syringe be held in a position with the piston chamber at the bottom the inlet ends of the tubing wil assume a (position adjacent said piston chamber an the lower- 1 most part of the reservoir.

o discharge the liquid from the reservoir with the discharge end of the syringe tilted .upward or downward relative to a horizontal position, valve mechanism is pro, vided to automatically shut off the inlet to the tubing which is u permost from the intake 26 and connect t e lowermost inlet to the tubing thereto, said valve mechanism consisting of a pair of valves 31 to cooperate with valve seats 32 connected to or formed in the ends of the T-portion of the intake 26, and said valves being connected by a rod 33 of greater length than the T.-portion of the intake so that when one of the valves is seated the other will be unseated, as clearly shown.

he piston chamber,'as in the application hereinbefore referred to, comprises a cylinder having a drivin fit with the ends 34 and 35 and in which t e suction inlets 7 and 8 are located, the piston chamber being clamped to the reservoir end 3 by the nut 18 130 of the tube 12 closed by cooperating with the end 35, the said end having a bore of the same diameter as and which may be a continuation of the cylinder bore and at the outer end internally screw threaded for the engagement of the nut 18 whereby to permit of the drawing of the piston mechanism by the removal of the nut 18. To roperly position the pumping mechanism't e end or head 35 has a projection 36 to engage in a recess 37 in the reservoir end 3.

To seal the umping mechanism to prevent leakage wiien the syringe is not in use, I provide a tube 38 connected to the stufling box 13 and in which the outlet end of the reciprocable tube 12 engages, this tube 38 being of a length to extend adjacent the dis charge nozzle and carries a valve at its free end to engage with the discharge end of the tube 12' when the piston is in its inner-most position, this valve consisting of a disk 39 carried by a cap connected to the end of tube 38 and caused to be moved in a direction toward the tube 12 by a spring 40. The flow of the liquid from tube 38 into chamber 11 is through lateral ports 41. Then the syringe is in use the inward movement of the valve is limited by the engagement thereof with the end of the tube 38. The tube 12 is of such length that when the piston rod is in its innermost position the end of the tube 12 will engage partly in the cap 39 and the valve will be firmly forced against the end of the tube by the spring 40. To look the iston in its innermost position with the end the valve, I provide cooperating locking parts on the piston rod and reservoir consisting of a projection or in 42 extending laterally from the piston rod and which is adapted to cobperate with a cam slot 43 in an annular extension of the nut 18.

The reservoir may be divided longitudinally by a partition or wall 44, providing two chambers in the reservoir one in which the pumping mechanism may be located and the other for the fire extinguishing liquid in which the intake for the pumping mechanism engages.

Having thus claim 1. In a syringe, the combination with a reservoir having an outlet, of a piston chamber; a piston to reciprocate in said chamber; a tube reciprocable with the piston to connect the piston chamber with the outlet of the reservoir; and a valve to cooperate with the outlet end of said tube when the piston is in its innermost position, substantially as and for the purpose specified.

2. In a syringe, the combination with a reservoir having an outlet, of a piston chamher; a piston to reciprocate described my invention I in said chamber; a compression chamber connected to the reservoir outlet; a tube reciprocable with the piston to connect the piston chamber with the compression chamber; and a valve in the compression chamber to cooperate with the outlet end of said tube when the piston is in its innermost position, substantially as and for the purpose specified.

3. In a syringe, the combination with a reservoir having an outlet, of a piston chamber; a piston to reciprocate in said chamber; a tube reciprocable with the piston and through which the liquid is discharged from the piston chamber; and means to connect the said tube to the reservoir outlet including a valve to cooperate with the end of the tube when the piston is in its innermost position, substantially as and for the purpose specified.

4. In a syringe, the combination with a reservoir having an outlet, of a piston chamher; a piston to reciprocate in said chamber; a compression chamber connected to the reservoir outlet; a tube reciprocable with the piston to connect the piston chamber with the compression chamber; a rod to reciprocate the piston and tube; a valve in the compression chamber to cooperate with the end of the reciprocable tube within said chamber to close said end of the tube when the piston is in its innermost position, substantially as and for the purpose specified.

5. In a syringe, the combination with a reservoir having an outlet, of a piston cham her; a piston to reciprocate in said chamber: a compression chamber connected to the reservoir outlet; a tube reciprocable with the piston to connect the piston chamber with the compression chamber: a rod to reciprocate the piston and tube; a valve in the compression chamber to cooperate with the end of the reciprocable tube within said chamber to close said end of the tube when the piston is in its innermost position; and cotiperating locking means carried by the piston rod and reservoir to maintain the piston mechanism in position with the tube closed by the valve, substantially as and for the purpose specified 6. In a syringe, the combination with a reservoir having an outlet, of a piston chamber; a piston to reciprocate in said chamber, a compression chamber connected to the reservoir outlet; a tube reciprocable with the piston to connect the piston chamber with the compression chamber; a rod to reciprocate the piston and tube; a tube in the compression chamber fixed at one end to the piston chamber and the other and extending adjacent the reservoir outlet in which the reciprocable tube engages, said tube having lateral ports to connect it with the compres sion chamber a spring influenced valve carried at the free end of said tube to close the end of the reciprocable tube when the piston is in its innermost position: and cooperating locking means carried by the piston rod tially as and for th and reservoir to maintain the piston in its innermost position with the end of the reciprocable tube closed by the valve, substantially as and for the purpose specified.

In a syringe, the combination with a reservoir having an outlet, of a piston chamber; a piston to reciprocate in said chamber; acom ression chamber; a tube reciprocable with the piston to connect the piston chamber with the compression chamber; and a valve to cooperate with said tube, substane purpose specified.

8. In a fire extinguisher, the combination of a container for fluid having an outlet, of a piston chamber; a compression chamber connected to the piston chamber and container outlet; piston mechanism to draw liquid to the piston chamber and discharge it into the compression chamber, the connection between said piston and compression chambers including means carried by the piston mechanism; and means cooperating with said last named means to shut off communication between the piston and compression chambers for the purpose specified.

In a syrin e, the combination of a reservoir to contain iquid and having a discharge outlet; a piston chamber supported in a fixed position in the reservoir and connected at opposite ends with the reservoir; a compresslon chamber connected to the piston chamber and reservoir outlet; piston mechanism to alternately draw liquid from the reservoir to opposite ends of the piston chamber and dlscharge it into the compression chamber; the connection between said piston and compression chambers including means carried by the piston'mechanism, and valve mechanism to cooperate with said last named means when the piston mechanism is in its innermost position to shut ofl. communication between the piston and compression chambers for the urpose specified.

10. In a syringe, t reservoir having a discharge outlet; a iston chamber supported in a fixed position in the reservoir; a com ression chamber to connect the piston cham er at one end to the reservoir outlet; a piston; valve mechanism to control the entrance of liquid to and its discharge from the piston chamber at opposite sides of the piston; and a valve operable when the piston is in its innermost position to shut ofl' communication between the piston and compression chambers, for the purpose specified.

11. In a syringe, the combination with a reservoir having an outlet, of a piston chamber; a piston to reciprocate in said chamber; a tube reciprocable with the piston to connect the piston chamber with the reservoir e combination of a outlet; and a valve to cooperate with said tube to seal the reservoir outlet.

12. In a syringe, the combination of a reservoir having a longitudinal partition to separate the reservoir into two chambers having no communication with each other and one of which chambers constitutes a liquid carrying chamber; a pumping mechanism located in the other chamber having an outlet to the exterior of the reservoir; and intake means from the liquid carrying chamber connected to the pumping mechanism through the partition and arraniged to draw the liquid from near the side an end of said chamber which is lowermost.

GEO. T. PEARSON S. 

